| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer | |
| Ecoregion: | 15a - Grave Creek Range-Nine Mile Divide | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 59866 - Saint Regis, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 25 | 30 | 37 | 43 | 46 | 45 | 38 | 31 | 24 | 18 | 31 |
| Avg Max Temp (°F) | 31 | 38 | 47 | 57 | 66 | 73 | 81 | 82 | 71 | 57 | 39 | 31 | 56 |
| Avg Precip (In.) | 2.29 | 1.78 | 1.45 | 1.48 | 1.86 | 1.75 | 1.16 | 1.3 | 1.34 | 1.62 | 2.37 | 2.39 | 20.76 |